Optimization of system chip rate in adaptive DS/CDMA communications over Nakagami fading channels

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Abstract

We study the optimal chip rate of adaptive power and rate direct-sequence code division multiple access (DS/CDMA) communication systems in Nakagami fading channels. We find that the optimal chip rate that maximizes the spectral efficiency depends upon both the channel parameters, such as multipath intensity profile (MIP) and line-of-sight (LOS) component, and the adaptation scheme itself. With the rate adaptation, the optimal chip rate is less than 1/T m irrespective of the channel parameters, where T m is multipath delay spread. With the power adaptation, however, the optimal chip rate and the corresponding number of tabs in RAKE receiver are function of the MIP and the LOS component.

Original languageEnglish
Title of host publicationConvergence and Hybrid Information Technology - 6th International Conference, ICHIT 2012, Proceedings
Pages32-36
Number of pages5
DOIs
StatePublished - 2012
Event6th International Conference on Convergence and Hybrid Information Technology, ICHIT 2012 - Daejeon, Korea, Republic of
Duration: 23 Aug 201225 Aug 2012

Publication series

NameCommunications in Computer and Information Science
Volume310 CCIS
ISSN (Print)1865-0929

Conference

Conference6th International Conference on Convergence and Hybrid Information Technology, ICHIT 2012
Country/TerritoryKorea, Republic of
CityDaejeon
Period23/08/1225/08/12

Keywords

  • DS/CDMA
  • fading
  • optimal chip rate
  • power and rate

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